Hand-operated drill.



C. 0. BERT.

HAND OPERATED DRILL.

APPLICATION FILED APR. 27.19IL

1,267,174. Patented May 21, 1918.

2 SHEET$SHEET I.

FIG.1.

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z E I 14 aaw/fi C. O. BERT. HAND OPERATED DRILL. APPLICATION FILED APR;27, 19H- Patented May 21,1918.

2 SHEETS--SHEET 2.

FIG. 3.

CELEST O. BERT, 0F WINOOSKI, VERMONT.

,nnnn-ornnnrnn DRILL.

Specification of Letters Patent. Patented flay 21, 1918,

Application filed April 27, 1917. Serial No. 164,994,

To all whom it may concern:

Be it known that I, CnLEs'r O; BERT, a subject of the King of Italy, residing at /Vinooski, in the county of Chittenden and State of Vermont, have invented certain new and useful Improvements in Hand-Operated Drills, of which the following is a specification. e

The primary object of the invention is the provision of a drill especially serviceable as a rock drill although adaptable for boring in wood, salt or other material, the arrangement being such that the boring tool is automatically rotated and cleaned during the operative longitudinal impulses imparted thereto.

' In the drawings forming a part of this application and in which like designating characters refer to corresponding parts throughout the several views Figure 1 is an elevational view of the device with the casing lid removed and the bit and a portion of the tool holder shown in section.

Fig. 2 is asectional view taken upon line IIII of Fig. 1 with the bit and a bracket partially broken away.

Fig. 3 is a detail elevational view.

Fig. 4 is a sectional view upon line IIII-IIII of Fig. 3, and,.

Fig. 5 is a vertical sectional view taken substantially upon the line V-'V'of Fig. 3. The present drilling machine is adapted for hand operation and provides a casing 10 for the mechanism while a handle 11 upon the top thereof is utilized for positioning the" device to place the bit 12 carried by a tool holder 13 in proper position for operating upon the work.

A depending sleeve 14: is arranged upon the bottom of the casing 10 having an axial bore 15 in alinement with an opening in the bottom of the casing and through which bore and opening the bit holder 13 is longitudinally slidably arranged. The tool holder 13 is formed with a lower portion 17 having a receiving socket 18 in its lower end for removably retaining the bit 12 while the upper portion 19 of the holder has an upper head or anvil 20 adapted for successive engagement by a hammer 21 for depressing the holder and bit.

A slot 22 is provided through the sleeve 14: within which an expansion spring 23 is mounted surrounding the holder portion 17 and tensioned between the bottom 24: of the slot and a shoulder 25' upon the holder portion 17. spring 23 normally maintains the holder 13 and bit 12 elevated while the hammer 21 successively projects the said members tobe automatically retracted by said spring.

A power shaft 26 is j ournaled through the casing 10 and has a turn wheel 27 arranged thereon outwardly of the casing and provided with a handle 28. The hammer 21 is substantially cubical in form consisting of a solid weight formed of gnetal such as iron, and slidably arranged within a bracket 29 having four depending legs 30 seating within corner recesses of the hammer.

Oppositely-projecting arms 32 are pm- It will be understood that the vided upon the hammer 21 to the free ends i of which are attached the upper ends of lowering springs 33 having threaded bolts 31 at their lower ends projecting through perforations in the bottom 36 of the casing 10 and provided with winged nuts 37 adapted for regulating the tension of the springs 33. Substantially S-shaped double cams 38 are secured to the shaft 26 adapted to engage rollers 39 journaled upon stub shafts projecting from the hammer 21 at the opposite sides thereof unprovided with the arms It will be understood from this description of the elements that by turning the wheel 27 the shaft 26 and cams 38 are revolved, bringing the latter into engagement with the rollers 39, thereby elevating the hammer 21 against the action of the springs 33. lVhen the rollers 39 pass olf of the ends 11 of the cams, being released thereby, the hammer 21 will descend with great rapidity and force by reason of both its weight and action of the springs 33 violently contacting the upper face 12 of the anvil 20 and forcing downwardly the holder 13 and bit 12 against the action of the spring 23 and accomplishing the operative impulse of the tool. It will be understood that the spring 23 retracts the holder and bit after each impulse of the hammer 21, the mechanism operating with great rapidity during the turning of the wheel 27. p

A turn collar 43 surrounds a rectangular portion 44: of the holder section 19 being longitudinally slidably positioned thereon against relative rotation thereto by means of the rectangular form of the portion 4% and the opening 15 provided in the collar 43.

A star wheel 50 is carried by the inner end of a shaft 51 journaled between a suitable jacent side 54 of the casing 10;. The shaft- 51 is operatively connected to the shaft 26 by means of a train of gears consisting of gears 55 and 56 secured to the shafts 26 and 51 respectively, andqan intermediate idler,

gear 57 journaled upon a post 58 carried by the casing side 54. The'gear ratio betweenthe power shaft 26 and star wheel shaft 51 plish the required speed of rotation for the holder 13 an d'b'it 12, it being understood that during the actuation of the hammer 21 when thewheel 27 is turned,'the star wheel 50. simultaneously revolves the holder and bit whereby the drilling operation is facilitated. i

As shown clearly in Figs. 3, 4 and 5 an arcua te side 71' is provided on the sleeve 43 adjacent the star Wheel 50 carried adjacent the end of the shaft 51, said'shaft having a projecting free end 72 freely positioned within a circular guide-Way 73 of the said sleeve face 71. A plurality of pins 'orrollers, 49 are arranged in spaced relations around the guide-way 73 and adapted to be operatively engagedby the star wheel 50 during the turning 'ofthe shaft'51 whereby oscillation will be given to the sleeve 43 which will be imparted to the drill holder 13. A centralhub 74 in the form of a journaled roller is arranged intermediate the rollers 49 while the bracket 52 carried by the bottom 36 of the casing 10 supports the shaft 51 andhas a stop finger 47 positioned beneath and supporting said sleeve 43. It will be understood that the shaft 51 is revolved by means of the gears 55 and 56 as heretofore explained, and that the movements of thesleeve 43 imparta substantially circular movement to the hub 74 while the sleeve will be elevated duringits movements to the position illustrated by dotted lines in Fig. 5, the turning. movement of the sleeve as indicated by the arrows in Fig. 4- eifecting back and forth, alternate partial rotations to the drill holder and consequently to the drill itself.

A. blower is usually employed with the structurefconsisting of a fan 59 journaled withina blower casing 60 arranged within the main casing 10 and having a flexible tube 61 secured to the holder portion 19, an axial conduit 63 being provided through the holder and communicating With the tube 61 as well as the bit socket 18. v The bit 12 is may be suitably altered as desired to accom also provided with an axial conduit 64 Where by air from the fan 59 will be forced through the bit, thus blowing the dust and drillingslout ofthe hole where the bit is operat-.

ing. A shaft 65 is provided for the fan 59 having a pulley wheel 66 thereon which is operatively connected by means of a belt 67 with 'a pulley Wheel 68 upon the power shaft 26.

The complete operation of the device will be apparent from the'foregoing descriptibn of the operation of the drill propelling and revolving mechanism as .well as the cleaningj blower, all 'of whicharesimultaneously actuated by turning the shaft 26 upon turning the "wheel 27 with themachine held in operative position by means of the handle 11.

What I claim asnewisi 1. A drilling machine comprising a casing, a drill holder mounted for reciprocatorymovement therein, a sleeve sli'dably mounted upon the holder and having an arcuate side pro'videdwith a circular guide slot, spaced rollers carried by the sleeve and locatedaroundthe slot, an operating shaft having an end located in the slot, and a star-wheel mounted on the shaft and adapted to engage'the rollers during the reciprocations of the holder.

:2. A drilling machine comprising a holder mounted for reciprocatory movement and having arectangular portion, a sleeve mounted for oscillatory movement and slidable on the holder, spaced rollers arranged in a circle upon the sleeve, and a rotatable operating starqvheelfor the sleeve arranged within the circle of rollers and adapted to engage the rollers successively during the operation of the device.v g V 3. A drilling machine comprising a re-' ciprocable drill holder having a rectangular portion, an oscillatingsleeve for the said holderslidably arranged thereon, spaced rollers arranged in a circle upon thesleeve,

anfoperating star-wheelfor the sleeve adapt- I GELEST o; BERT.

I Copies, of this patentmay be obtained for fivecents each, by addressing the Comrnissioner of Yatents,

I Washington, D. 0.. r

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